When the air turned poisonous the Canadians didn’t retreat; they stood and fought.This episode dives into the first poison-gas attack at Ypres and the brutal legacy it left behind. From the shock of the areen cloud to the lifelonc scars of gas exposure, we follow the Canadians who faced a weapon the world had sworn never to use. A viscera
iournev into terror. survival. and the moment modern war
crossed a line it could never uncross.
During the first gas attack at Ypres in April 1915, John “Jackie” Lynn found himself in a collapsing line as chlorine gas rolled across the battlefield. With no warning and little protection, Lynn manned his machine gun as the green cloud closed in. He fired continuously into the advancing enemy, holding his position even as the gas burned his lungs and blinded his eyes. At a time when gas masks were scarce or ineffective, Lynn fought without one, refusing to abandon his gun while others around him fell choking to the ground.
Lynn’s stand helped stem the German advance at a moment when the front should have broken completely. But the cost was immense. Prolonged exposure to the gas left him permanently damaged, and he would later die as a result of the injuries sustained during the attack. Awarded the Victoria Cross for his courage under unimaginable conditions, John “Jackie” Lynn’s story is a stark reminder of what gas warfare demanded of those who faced it—men who held their ground not just against the enemy, but against the air itself.
Gas Warfare in the Great War
World War I introduced chemical warfare on an industrial scale, turning the battlefield itself into a weapon. The first gas widely used was chlorine, released in vast clouds that drifted with the wind. Its sharp smell offered little warning, and once inhaled it burned the lungs, causing suffocation and panic. As soldiers adapted with crude gas masks, deadlier agents followed.
Phosgene was far more lethal and insidious—often odorless or smelling faintly of cut hay, it could be inhaled without immediate effect, only for the lungs to fill with fluid hours later. Mustard gas, introduced in 1917, did not always kill but left lasting damage. It blistered skin and eyes, burned airways, and contaminated ground for days, ensuring that even survivors carried lifelong injuries. Together, these gases left a legacy of suffering that extended far beyond the armistice, shaping international law and forever changing how war was fought.